HELP! My DS40 does not seem to want to play. First I should say it is at home and has not moved an inch. I played it yesterday all was fine. I keep the volume way down. The first thing I did was make sure the pedalboard was working. Then I checked the speaker connections. Then I isolated the cords and plugged them in direct. Then to be sure I took a known working cord and plugged it in. Nothing. The amp turns on, the volume is on but no sound comes out. Not even a hiss. Hopefully it's something simple. But I don't get it. NOTHING has changed since yesterday when it worked. Any thoughts?